Organic light-emitting display panel and display device

Abstract

Provided are an organic light-emitting display panel and a display device. The organic light-emitting display includes an array substrate and organic light-emitting components each having anode, cathode and organic functional layer. The organic functional layer includes an organic light-emitting layer, a first and second electron transmission layer and an electron injection layer. The first electron transmission layer and electron injection layer include a first dopant containing an alkaline earth metal element or a rare earth metal element. A work function φ1 of the electron injection layer and a work function φ2 of the cathode satisfy: φ1<φ2, and the work function φ1 of the electron injection layer and a work function φ3 of the first dopant satisfy: φ1≥φ3. LUMO1 and LUMO2 satisfy: |LUMO1−LUMO2|<0.18 eV.

What is claimed is: 
     
       1. An organic light-emitting display panel, comprising:
 an array substrate comprising a plurality of driving elements; and 
 a plurality of organic light-emitting components corresponding to the plurality of driving elements, wherein each of the plurality of organic light-emitting components comprises an anode, a cathode and an organic functional layer disposed between the anode and the cathode, and wherein the organic functional layer comprises an organic light-emitting layer, a first electron transmission layer disposed between the cathode and the organic light-emitting layer, an electron injection layer disposed between the cathode and the first electron transmission layer, and a second electron transmission layer disposed between the first electron transmission layer and the organic light-emitting layer, 
 wherein the first electron transmission layer comprises a first dopant, and the first dopant comprises an alkaline earth metal element or a rare earth metal element, 
 wherein the electron injection layer comprises an alkaline earth metal element or a rare earth metal element, and a work function φ1 of the electron injection layer and a work function φ2 of the cathode satisfy: φ1<φ2, 
 wherein the work function φ1 of the electron injection layer and a work function φ3 of the first dopant satisfy: φ1≥φ3, and 
 wherein the second electron transmission layer is undoped by the first dopant, and a lowest unoccupied molecular orbital of an electron transmission matrix in the first electron transmission layer LUMO1 and a lowest unoccupied molecular orbital of an electron transmission matrix in the second electron transmission layer LUMO2 satisfy: |LUMO1−LUMO2|<0.18 eV. 
 
     
     
       2. The organic light-emitting display panel according to  claim 1 , wherein the electron injection layer has a thickness d1 satisfying d1≤5 nm. 
     
     
       3. The organic light-emitting display panel according to  claim 1 , wherein the first dopant is doped in the first electron transmission layer in a volume percentage of 0.5% to 7%. 
     
     
       4. The organic light-emitting display panel according to  claim 1 , wherein the second electron transmission layer has a thickness d2 satisfying: 2 nm≤d2≤60 nm. 
     
     
       5. The organic light-emitting display panel according to  claim 1 , wherein a material of the electron injection layer is a same material as a material of the first dopant. 
     
     
       6. The organic light-emitting display panel according to  claim 1 , wherein a material of the electron injection layer is different from a material of the first dopant. 
     
     
       7. The organic light-emitting display panel according to  claim 1 , wherein the work function φ1 of the electron injection layer and the work function φ2 of the cathode satisfy: φ2−φ1≤1.66 ev, and
 wherein the work function φ1 of the electron injection layer and the work function φ3 of the first dopant satisfy: φ1−φ3≥0.14 ev. 
 
     
     
       8. The organic light-emitting display panel according to  claim 1 , wherein the electron injection layer comprises one metal element selected from an alkaline earth metal element and a rare earth metal element, and
 wherein the first dopant comprises at least two metal elements selected from an alkaline earth metal element and a rare earth metal element. 
 
     
     
       9. The organic light-emitting display panel according to  claim 1 , wherein the first dopant comprises at least one of Mg, Ga, Yb, Sm, Tm, Y, Gd or Lu. 
     
     
       10. The organic light-emitting display panel according to  claim 1 , wherein the first dopant comprises at least one selected from an alkaline earth elementary metal element and a rare earth elementary metal element. 
     
     
       11. The organic light-emitting display panel according to  claim 1 , wherein the first dopant is a metallic compound. 
     
     
       12. The organic light-emitting display panel according to  claim 1 , wherein the electron injection layer is made of a material of an alkaline earth elementary metal, a rare earth elementary metal or a metal oxide. 
     
     
       13. The organic light-emitting display panel according to  claim 1 , wherein the organic functional layer further comprises a third electron transmission layer disposed between the first electron transmission layer and the second electron transmission layer. 
     
     
       14. The organic light-emitting display panel according to  claim 13 , wherein the third electron transmission layer is undoped by the first dopant. 
     
     
       15. The organic light-emitting display panel according to  claim 13 , wherein the third electron transmission layer is doped with the first dopant, and
 wherein a doping concentration of the first dopant in the third electron transmission layer is smaller than a doping concentration of the first dopant in the first electron transmission layer. 
 
     
     
       16. The organic light-emitting display panel according to  claim 15 , wherein a doping concentration of the first dopant at a side of the third electron transmission layer close to the first electron transmission layer is greater than a doping concentration of the first dopant at a side of the third electron transmission layer away from the first electron transmission layer. 
     
     
       17. The organic light-emitting display panel according to  claim 13 , wherein a material of an electron transmission matrix in the third electron transmission layer is a same material as a material of an electron transmission matrix in the first electron transmission layer, or
 the material of the electron transmission matrix in the third electron transmission layer is a same material as a material of an electron transmission matrix in the second electron transmission layer. 
 
     
     
       18. The organic light-emitting display panel according to  claim 1 , wherein a highest occupied molecular orbital of the second electron transmission layer HOMO2 and a highest occupied molecular orbital of a host material in the organic light-emitting layer HOMO3 satisfy: |HOMO2−HOMO3|<1 eV. 
     
     
       19. The organic light-emitting display panel according to  claim 1 , wherein light emitted from one of the plurality of organic light-emitting components is emitted toward the cathode, and a structure between the second electron transmission layer and the cathode has a transmittance of T≥65% for light emitted from the organic light-emitting layer. 
     
     
       20. An organic light-emitting display device, comprising the organic light-emitting display panel according to  claim 1 .